Speaker
Nataliia Kovalchuk
(Deutsches Elektronen-Synchrotron (DESY))
Description
The exclusive deep inelastic electroproduction of $\psi(2S)\rightarrow \mu^+\mu^-$, $\psi(2S)\rightarrow J/\psi\pi^+\pi^-\rightarrow \mu^+\mu^-\pi^+\pi^-$ and $J/\psi\rightarrow \mu^+\mu^-$ have been studied with the ZEUS detector at HERA using an integrated luminosity of $354$ pb$^{-1}$. The analysis was carried out in the kinematic range $5 < Q^2 < 70$ GeV$^2$, $30 < W < 210$ GeV and $|t| < 1$ GeV$^2$, where $Q^2$ is the photon virtuality, $W$ the photon-proton centre-of-mass energy and $t$ the squared four-momentum transfer at the proton vertex. The cross-section ratio $\sigma_{\psi(2S)}/\sigma_{J/\psi}$ has been measured as a function of $Q^2$, $W$ and $t$.
Primary author
Matthew Wing
(UCL)
